2009Now: Eberly Family Distinguished Professor of Mathematics, Math. Dept. West Virginia University
1996Now: Professor, Math. Dept. West Virginia University
19891996: Associate Professor, Math. Dept. West Virginia University
19871989: Assistant Professor, Math. Dept. West Virginia University
19861987: Assistant Professor (limited term) Math. Dept. Simon Fraser University, B.C., Canada
Education:
B.Sc. (N/A) (No undergraduate education due to Cultural Revolution)M.Sc. (1982) Qufu Normal University, China, Operation Research/Mathematics
Ph.D (1987). Simon Fraser University, B.C., Canada, Mathematics
Research Interests:
Graph theory, discrete optimization, algorithm design and their application in data science.Courses offered at WVU:
 Math 155
 Math 156
 Math 251
 Math 375
 Math 573
 Math 773
 Math 791
Recent Publications:
Monographs
Integer Flows and Cycle Covers of Graphs, Marcel Dekker Inc. (1997) ISBN: 9780824797904.

Circuit Double Covers of Graphs, Cambridge University Press, (2012) ISBN13: 9780521282352.
Journal Papers
173. BergeFulkerson coloring for some families of superposition snarks (with S. Liu, R. Hao), European Journal of Combinatorics 96 (2021) 103344.
170. Integer flows and modulo orientations of signed graphs (with Miaomiao Han, Jiaao Li, Rong Luo, Yongtang Shi) SIAM J. DISCRETE MATH. Vol. 35, No. 1, (2021) pp. 376391.
169. Circular Flows via Extended Tutte Orientations (with Jiaao Li, Yezhou Wu) Journal of Combinatorial Theory (B) Vol. 145 (2020) 307322.
168. BergeFulkerson coloring for C(12)linked permutation graphs (with S. Liu, R. Hao, Z. Zhang), Journal of Graph Theory, (2021)
165. Flows on owadmissible signed graphs (with M. DeVos, J. Li, Y. Lu, R. Luo, Zhang Zhang) Journal of Combinatorial Theory, B. 149 (2021) p.198221.164. Flows on signed graphs without long barbells (with
You Lu, Rong Luo, Michael Schubert, Eckhard Steffen) SIAM
J. DISCRETE MATH. Vol. 34, No. 4, (2020) pp. 21662182
163. Cycle double covers
and nonseparating cycles (with A. HoffmannOstenhof, Z. Zhang) European J.
Combinatorics, 81 (2019)
276284, doi.org/10.1016/j.ejc.2019.06.006
161. Cycle covers (III)  Compatible circuit decomposition and K5transition minor (with H. Fleischner, B. Bagheri Gh and Z. Zhang) J. Comb. Theory, B. 137 (2019) 2554. doi.org/10.1016/j.jctb.2018.11.008.
157. The flow index and strongly connected orientation, (with J. Li, C. Thomassen and Y. Wu) European J. Combinatorics 70 (2018) 164177, doi.org/10.1016/j.ejc.2017.12.009.
156. Multiple weak 2linkage and its
applications on integer flows of signed graphs, (with Y. Lu, R. Luo) European J. Combinatorics 69 (2018) 3648 dx.doi.org/10.1016/j.ejc.2017.09.002.
154. Counterexamples to Jaeger's Circular Flow Conjecture, (with MJ. Han, J. Li, Y. Wu) J. Comb. Theory, B. 131 (2018) 111 doi.org/10.1016/j.jctb.2018.01.002
153. Signed graphs: from modulo flows to integervalued ows, (with J. Cheng, Y. Lu and R. Luo) SIAM J. DISCRETE MATH. 32 (2018) 956965. 10.1137/17M1126072.
150. BergeFulkerson coloring for C(8)linked graphs, (with R. Hao and T. Zheng) J. Graph Theory 88 (2018) 4660 DOI: 10.1002/jgt.22184.
149. Shortest circuit covers of signed graphs, (with Y. Lu, J. Cheng, R. Luo) J. Comb. Theory, B. 134 (2019) 164178. doi.org/10.1016/j.jctb.2018.06.001.
148. The 3flow conjecture, factors modulo k, and the 123conjecture, (with C. Thomassen, Y.Wu) J. Comb. Theory, B. 121 (2016) 308325. dx.doi.org/10.1016/j.jctb.2016.06.010
124. Nowherezero 3flows and generalized Tutte orientations (with L. M. Lovasz, C. Thomassen, Y.Wu ) J. Comb. Theory, B. 103 (2013) 587598; doi:10.1016/j.jctb.2013.06.003
106. Cycle covers (II) circuit chain, Petersen chain and Hamilton weights J. Comb. Theory, B. 120 (2016) 3663; doi:10.1016/j.jctb.2016.04.001